Improve log message for anonymous users

Problem/Motivation

+++ b/src/Form/PollViewForm.php
@@ -256,21 +268,23 @@ class PollViewForm extends FormBase {
+    \Drupal::logger('poll')->notice('%user\'s vote in Poll #%poll deleted.', array(
+      '%user' => $this->currentUser()->id(),
+      '%poll' => $this->poll->id(),
+    ));

This is pretty useless for an anonymous user currently.

Proposed resolution

Improve log message.

Remaining tasks

User interface changes

API changes

Data model changes